Seeds of South Australia
Logania scabrella (Loganiaceae)
Rough Logania
List of species for Logania
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Seed collecting:
October to December
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [endemic to KI; in Flinders Chase; very small numbers, threatened by roadworks]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Logania]
Name derivation:
Logania named after James Logan (1674-1751), an Irish born botanist who emigrated to North America, became Governor of Pennsylvania and wrote a book on the sexuality of plants. Scabrella from the Latin 'scaber' meaning rough to the touch, scurfy; referring to the slightly rough covering of hairs (by touch) of the branchlets 
Distribution:
Endemic to South Australia and found only on the western end of Kangaroo Island, growing in Eucalyptus remota tall-shrubland over a heathy understorey on sandy loams to clayey soils, overlying laterites.
Status:
Native. Rare in South Australia.
Plant description:
Erect shrub to 1 m high, dioecious, branches subterete, often with two lateral ridges, densely and minutely hairy  Leaves ovate to narrowly ovate, to 18 mm long and 8 mm wide, base rounded to slightly cuneate, margin slightly recurved, often with a few hairy near base, apex obtuse, lower surface glabrous. Inflorescence a terminal clusters with tiny white unisexual flowers. Flowering between August and October.
Fruit type:
Orange-brown ovoid capsule to 5 mm long and 3.5 mm wide.
Seed type:
Shiny black long convex seed to 1.5 mm long and 0.7 mm wide, with a reticulated surface.
Embryo type:
Linear fully developed.
Seed collecting:
Collect maturing capsules, those that are fat, turning orange-brown in colour, have not open and contain hard black seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for one to two weeks for it to split. Then rub the capsules gently with a rubber bung to dislodge the seeds. Use a sieve to separate the unwanted material. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place.
Seed viability:
From one collection, the seed viability was high, at 100%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-1618%35 dNA 30% hydrogen peroxide 20 min, water rinse, 500 mg/L gibberellic acid 24 h;
1% agar;
Incubated under winter conditions
Jul-1616%49 dNA dry heat 90°C oven 15 min, 30% hydrogen peroxide 20 min, water rinse, 10% smoke water + 500 mg/L gibberellic acid 24 h;
1% agar;
Incubated under winter conditions
Jul-162%49 dNA 30% hydrogen peroxide 20 min, water rinse, 10% smoke water 24 h;
1% agar;
Incubated under winter conditions
Jul-160%NANA 30% hydrogen peroxide 20 min, water rinse;
1% agar;
Incubated under winter conditions
Jul-160%NANA dry heat 90°C oven 15 min, 30% hydrogen peroxide 20 min, water rinse;
1% agar;
Incubated under winter conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)